The eagle's recovery is a wildlife success story, but conservationists say animals that remain on the list may be less protected due to recent rulings that could undermine the Endangered Species Act.

The fear of exile and almost certain death causes emerald coral gobies to go on crash diets rather than grow large enough to threaten higher-ranking fish.

House cats of all shapes and sizes are descended from a single wild ancestor—the Near Eastern wildcat—that still thrives today, a new DNA study reveals.

The elusive recurve-billed bushbird seems to give a hint of a smile in this first photo of the bird ever released to the public.

Experts are close to piecing together the entire genomes of long-dead beasts. But bringing them back to life may—or may not—happen soon, depending on whom you ask.

Two species of ancient penguin have been uncovered in a Peruvian desert, including one that stood almost 5 feet (1.5 meters) tall, a new study reports.

Penguins the size of people roamed South America some 35 million years ago, and they didn't need ice to survive.

Related Photos: Giant Penguin Fossils

So it's not exactly America's Next Top Model. But this weird-looking bat got rave reviews when it recently posed for the camera for the first time.

Wolves with strong jaws and massive teeth roamed ancient Alaska eating prey completely—bones and all—according to a new study.

The asteroid that finished off the dinosaurs 65 million years ago opened up niches for the majority of today's living mammals, according to a new study.

A panda skull found in China shows that pandas were already adapted to eating bamboo two million years ago, but weighed in at just half the size of modern animals, according to a new study.

A Japanese aquarium's "ray of hope"—the first giant manta ray ever born in captivity—has died after just four days.

See the biggest winners and losers from this month's UN convention on the wildlife trade, which affected animals that appear on menus, in medicines, and in marketplaces worldwide.

Watching razor-equipped roosters slash each other to death is still legal in Louisiana, but the U.S. state looks likely to join all 49 others in banning the practice.

The calf that had dolphin "talk" played to him while in the womb died June 15 after what had appeared to be a healthy birth.